gemstone
Tumbled citrine (possibly heat-treated amethyst)
Quartz, SiO₂; trigonal crystal system
AI-generated identification · may be incorrectTranslucent golden-yellow to orange, vitreous luster, Mohs hardness 7, no cleavage and conchoidal fracture. The small polished pebble has inclusions or surface texture visible in the photo.
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Physical properties
Translucent golden-yellow to orange, vitreous luster, Mohs hardness 7, no cleavage and conchoidal fracture. The small polished pebble has inclusions or surface texture visible in the photo.
Formation & geological history
Quartz forms in hydrothermal veins and cavities; natural citrine’s yellow color commonly comes from iron-related defects. Much commercial citrine is amethyst heated to produce orange-yellow tones.
Uses & applications
Used in jewelry, decorative objects, and mineral collections.
Geological facts
Citrine is among the rarer naturally occurring quartz colors; heat treatment can make amethyst resemble it.
Field identification & locations
Quartz’s hardness and glassy luster are useful clues; color alone cannot distinguish natural citrine from treated amethyst. Citrine occurs in Brazil, Madagascar, and other quartz-bearing regions.
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